January in Alamo is the coldest month of the year. In January, the weather in Alamo is typically warm. Average daily high temperature in January is about 23 degrees above zero. On average, Alamo has 11 sunny, 9 partly cloudy, 6 cloudy, and 5 rainy days in January. The rains are usually light. January as well as February and December is considered the most comfortable time to visit Alamo.